Coherent beam-beam instability in collision with a large crossing angle

分類加速器物理セミナー
開始2017/06/29(木)10:00
終了2017/06/29(木)11:30
会場2号館1階会議室中
講演タイトル
講演者大見 和史氏
言語英語/English
連絡先大見 和史 (PHS 4413)
ウェブサイト
食堂・売店利用予定なし/0

概要

In recent years the "crab waist collision'' scheme has become popular for circular e+e- colliders. The designs of several future colliders are based on this scheme. Until recently the beam-beam effects for collisions under a large crossing angle with or without crab waist were mostly studied using weak-strong simulations. We here present a strong-strong simulation result, in which a novel strong coherent head-tail instability is seen, which can limit the performance of proposed future colliders. We explain the underlying instability mechanism starting from the "wake force'' induced by the beam-beam interaction. Using this beam-beam wake, the beam-beam head tail modes are studied by an eigenmode analysis. The instability may affect all collider designs based on the crab waist scheme. We suggest an experimental verification at SuperKEKB during its commissioning Phase II.

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